JP7271531B2 - Sleepers and methods for manufacturing sleepers - Google Patents

Description

The present invention relates to sleepers and methods of manufacturing sleepers.
This application claims priority based on Japanese Patent Application No. 2018-106064 filed in Japan on June 01, 2018, the contents of which are incorporated herein.

In some cases, an embedded plug is embedded in a sleeper made of resin or the like (see, for example, Patent Document 1). The embedded plug has a threaded portion and a flange provided on the outer peripheral surface of the end of the threaded portion. A female thread is formed on the inner peripheral surface of the threaded portion. The embedded plug is fixed by an adhesive (adhesive) in an embedded hole formed in the sleeper body of the sleeper.

When the sleepers are constructed in this way, it is possible to fix anchor bolts or the like to the embedded plugs of the sleepers without having to drill holes in the sleepers at the construction site. Furthermore, the flange improves the pull-out force withstanding pull-out of the anchor bolt or the like from the sleeper.

JP-A-2002-161501

The embedded plug may rotate about the central axis of the threaded portion within the embedded hole of the sleeper body.

The present invention has been made in view of such problems, and an object of the present invention is to provide a sleeper that suppresses the rotation of the embedded plug about the central axis of the threaded part, and a method for manufacturing the sleeper. do.

In order to solve the above problems, the present invention proposes the following means.
A sleeper according to an aspect of the present invention includes a sleeper body having a top surface on which a rail is arranged and a bottom surface facing a ground plane, and having a plurality of embedded holes penetrating from the top surface to the bottom surface; a plurality of embedding plugs at least partially disposed, the embedding holes having wide holes at the bottom thereof, the wide holes of the plurality of the embedding holes being spaced apart from each other, the plugs comprising: , a threaded portion, and a flange provided at the lower end of the threaded portion and arranged in the large hole portion, the flange portion being viewed in a direction along the central axis of the threaded portion. It has an elliptical shape,
When the sleeper body is viewed from the direction of the central axis of the threaded portion, the central axis of the threaded portion and the central axis of the flange portion are spaced apart from each other in the major axis direction of the elliptical shape. The inner peripheral surface is characterized by having an engaging portion with which the collar portion is engaged when the embedded plug rotates around the central axis of the threaded portion.

According to the sleeper described above, when the embedded plug rotates around the central axis of the threaded portion, for example, the collar portion may be engaged with the inner peripheral surface of the large hole portion in the circumferential direction of the threaded portion, or the flange portion may be pulled out of the embedded hole. It is locked to an adhesive that fixes the inner surface and the outer surface of the plug. Therefore, it is possible to suppress the embedded plug from rotating around the central axis of the threaded portion.
In addition, a plurality of embedding holes are formed in the sleeper body, and the sleeper has a plurality of embedding plugs. Therefore, one embedding plug can be arranged in one embedding hole. Therefore, compared to the case of arranging one embedding plug so as to cross two embedding holes, for example, the operation of placing the embedding plug in the embedding hole can be simplified.
In addition, when the embedded plug rotates around the central axis of the threaded portion, the collar portion engages with the engaging portion of the large hole portion in the circumferential direction of the threaded portion, so that the embedded plug rotates around the central axis of the threaded portion. You can prevent it from rotating.

Further, in the sleeper described above , the center of gravity of the flange may be arranged at a position spaced apart from the central axis.
According to this sleeper, it is possible to suppress rotation of the embedded plug about the central axis of the threaded portion when the flange has an elliptical shape when viewed in the direction along the central axis.

The locking portion is a proximal inner surface portion that is a portion having a predetermined distance from the central axis of the threaded portion, and is the distance from the central axis of the threaded portion to a predetermined portion of the outer peripheral surface of the flange. may be longer than the predetermined value.

An adhesive may be further provided for fixing the inner surface of the embedding hole and the outer surface of the embedding plug.
According to this sleeper, when the embedded plug rotates around the central axis of the threaded part, the collar part engages the adhesive body in the circumferential direction of the threaded part, so that the embedded plug rotates around the central axis of the threaded part. can be suppressed.

The collar portion has a proximate outer surface portion, which is a portion of the outer peripheral surface of the collar portion that is at a predetermined distance from the central axis of the threaded portion, and a spaced outer surface portion that is a portion whose distance from the center axis is longer than the predetermined value, and the bonded body is located between the outer peripheral surface of the collar portion and the inner peripheral surface of the large hole portion. It may be arranged over the entire circumference.
A method for manufacturing a sleeper according to an aspect of the present invention includes a hole forming step of forming the embedding hole in the sleeper main body, and an arranging step of inserting at least a part of the flange portion of the embedding plug into the embedding hole. and do.

According to the sleeper of the present invention, it is possible to suppress the rotation of the embedded plug about the central axis of the threaded portion.

FIG. 1 is a partially cutaway front view of rails fixed to sleepers according to the first embodiment of the present invention. FIG. 2 is a partially broken plan view showing the positional relationship of the sleepers, embedded plugs, and rails in FIG. 3 is an enlarged view of a main part in FIG. 2. FIG. FIG. 4 is a cross-sectional view taken along line A1-A1 in FIG. FIG. 5 is a flow chart showing the sleeper manufacturing method according to the first embodiment of the present invention. FIG. 6 is a vertical cross-sectional view for explaining the steps from the hole forming step to the fixing step in the manufacturing method of the same sleeper. FIG. 7 is a vertical cross-sectional view for explaining a removing step and a flattening step in the manufacturing method of the same sleeper. FIG. 8 is a cross-sectional view of a main part of a sleeper in a modified example of the first embodiment of the present invention. 9 is a cross-sectional view taken along the line A2-A2 in FIG. 8. FIG. FIG. 10 is a cross-sectional view of a main part of a sleeper in a modification of the first embodiment of the present invention. FIG. 11 is a cross-sectional view taken along line A3-A3 in FIG. FIG. 12 is a partially broken plan view showing another positional relationship of the sleepers, embedded plugs, and rails. FIG. 13 is a plan view of the embedded plug of the example. FIG. 14 is a vertical cross-sectional view of an embedding plug of an example. FIG. 15 is a plan view of an embedded plug of a comparative example. FIG. 16 is a vertical cross-sectional view of an embedding plug of a comparative example. FIG. 17 is a partially cutaway front view of rails fixed to sleepers according to the second embodiment of the present invention.

(First embodiment)
An embodiment of a sleeper according to the present invention will be described below with reference to FIGS. 1 to 16. FIG.
As shown in FIG. 1 , the sleeper 1 of this embodiment includes a sleeper body 11 , an embedded plug 16 and an adhesive body 21 .

The sleeper main body 11 is formed in a rectangular parallelepiped shape elongated in the width direction of the rail 51 (hereinafter simply referred to as the width direction). For example, the sleeper body 11 is preferably made of ESLON NEO LUMBER FFU (registered trademark, manufactured by Sekisui Chemical Co., Ltd.). ESLON NEO LUMBER FFU is a thermosetting resin foam in which long glass fibers are aligned in a predetermined direction (for example, the width direction) and embedded in a thermosetting resin. The sleeper body 11 may be made of wood or the like.
FIG. 1 shows only one of a pair of rails 52 forming rail 51 .

As shown in FIGS. 1 and 2, the sleeper body 11 has a top surface and a bottom surface. A rail 52 is arranged on the upper surface. The bottom faces a ground plane (not shown). The sleeper body 11 is formed with a plurality of embedding holes 12 penetrating from the top surface to the bottom surface. In the illustrated example, a pair of embedding holes 12 penetrating vertically through the sleeper body 11 are formed at each widthwise end of the sleeper body 11 . Note that FIG. 1 shows only one end in the width direction of the sleeper body 11 . In FIG. 2, the shape of the small-diameter hole portion 12a, which will be described later, is indicated by a chain double-dashed line. FIG. 2 does not show part of the adhesive body 21 . At each end of the sleeper body 11, a pair of embedded holes 12 are arranged so as to sandwich the rail 52 in the width direction.
A small diameter hole portion 12a is formed in a portion other than the lower end portion of the embedding hole 12 . The small-diameter hole portion 12a has a circular shape in plan view in the vertical direction. The small-diameter hole portion 12a extends vertically.
A large diameter hole portion (large hole portion) 12b is formed at the lower end portion of the embedding hole 12 .
In other words, the embedding hole 12 has a large diameter hole portion 12b at its bottom. The large-diameter hole portion 12b has a circular shape with an inner diameter larger than that of the small-diameter hole portion 12a in plan view. The large diameter hole portion 12b continues to the small diameter hole portion 12a.
The large-diameter hole portions 12a of the plurality of embedding holes 12 are separated from each other. In other words, the large-diameter hole portions 12a of the plurality of embedding holes 12 are not continuous in the width direction (horizontal direction). In the illustrated example, the plurality of embedding holes 12 themselves are not continuous in the width direction. The plurality of embedding holes 12 are independent of each other within the sleeper body 11 .

As shown in FIG. 2, the central axis of the large-diameter hole portion 12b and the central axis of the small-diameter hole portion 12a are displaced (separated) in the longitudinal direction of the rail 51 (hereinafter simply referred to as the longitudinal direction). It is The small-diameter hole portion 12a is arranged within the outer peripheral edge of the large-diameter hole portion 12b in plan view.
In the pair of embedding holes 12 formed in the ends of the sleeper body 11, the central axis of the small diameter hole portion 12a in one of the embedding holes 12 is offset to one side in the longitudinal direction with respect to the central axis of the large diameter hole portion 12b. are at a distance. Similarly, in the pair of embedding holes 12, the central axis of the small diameter hole portion 12a of the other embedding hole 12 is offset (separated) from the central axis of the large diameter hole portion 12b to the other side in the longitudinal direction.
By shifting the central axis of the small-diameter hole portion 12a in this way, when a screw is screwed into the embedded plug 16, the later-described collar portion 18 will not rotate within the large-diameter hole portion 12b, thus preventing co-rotation. be able to.

As shown in FIGS. 1 and 2, the embedded plug 16 includes a tubular portion 17 (threaded portion) and a collar portion 18 . The tubular portion 17 is formed in a cylindrical shape. The length of the cylindrical portion 17 is longer than the length of the small-diameter hole portion 12a and shorter than the length of the entire embedding hole 12. As shown in FIG. A female screw is formed on the inner peripheral surface of the tubular portion 17 . The outer diameter of the tubular portion 17 and the inner diameter of the small diameter portion 12a of the embedding hole 12 are approximately the same length. The cylindrical portion 17 except for the lower end portion is arranged inside the small-diameter hole portion 12a. The cylindrical portion 17 is arranged such that the center axis C1 of the cylindrical portion 17 extends along the vertical direction. The cylindrical portion 17 preferably closes the small-diameter hole portion 12a in a liquid-tight manner. A sealing member such as an adhesive may be arranged between the small-diameter hole portion 12a and the tubular portion 17 .
The internal space at the lower end of the cylindrical portion 17 corresponds to a drain hole for discharging rainwater or the like that has entered the cylindrical portion 17 to the outside of the cylindrical portion 17 .

As shown in FIGS. 3 and 4, the collar portion 18 has a plate shape. The collar portion 18 is provided on the outer peripheral surface of the lower end portion of the tubular portion 17 over the entire circumference of the tubular portion 17 . The collar portion 18 has an elliptical shape (elliptical shape) with the longitudinal direction as the major axis in a plan view. At this time, the cross-sectional area of the tubular portion 17 perpendicular to the central axis C1 of the tubular portion 17 is smaller than the cross-sectional area of the flange portion 18 perpendicular to the central axis C1.
The center of gravity P1 of the collar portion 18 is arranged at a position separated from the center axis C1. In this example, the central axis C1 is arranged on the long axis of the ellipse of the collar portion 18 . In other words, when the sleeper 10 is viewed from the direction of the central axis C1 of the cylindrical portion 17, the central axis C1 of the cylindrical portion 17 and the central axis of the flange portion 18 are separated from each other.
As shown in FIG. 3 , the collar portion 18 has a proximate outer surface portion 18 a and a separated outer surface portion (predetermined portion) 18 b on the outer peripheral surface of the collar portion 18 . The proximal outer surface portion 18a is a portion of the outer peripheral surface of the collar portion 18 where the distance L1 from the central axis C1 of the cylindrical portion 17 is the smallest (predetermined value). The spaced outer surface portion 18b is a portion of the outer peripheral surface of the collar portion 18 where the distance L2 from the center axis C1 is the maximum.
The spaced outer surface portion 18b is arranged at the end of the long axis of the ellipse of the collar portion 18 that is spaced apart from the central axis C1. A distance L2 between the distant outer surface portion 18b and the center axis C1 is longer than a distance L1 between the adjacent outer surface portion 18a and the center axis C1.

The collar portion 18 is arranged inside the large diameter hole portion 12 b of the embedding hole 12 . The distance between the inner peripheral surface of the large-diameter hole portion 12b and the center axis C1 is the minimum distance L3 at the proximal inner surface portion 12b1, which is a part of the inner peripheral surface of the large-diameter hole portion 12b. The inner peripheral surface of the large-diameter hole portion 12b does not include the surface along the horizontal plane at the connection portion between the large-diameter hole portion 12b and the small-diameter hole portion 12a.
The distance L3 is shorter than the distance L2 between the spaced outer surface portion 18b and the center axis C1. The separated outer surface portion 18b of the collar portion 18 is arranged so as not to face the adjacent inner surface portion 12b1 of the large diameter hole portion 12b. As shown in FIG. 4 , in this embodiment, the entire embedding plug 16 is arranged within the embedding hole 12 .
For example, the cylindrical portion 17 of the embedding plug 16 may protrude upward from the small diameter hole portion 12 a of the embedding hole 12 , and a part of the embedding plug 16 may be arranged inside the embedding hole 12 . Projections and grooves may be formed in the tubular portion 17 and the flange portion 18 . The collar portion 18 may be provided only partially in the circumferential direction of the tubular portion 17 .

For example, the tubular portion 17 is made of a steel pipe, and the collar portion 18 is made of a steel plate. The tubular portion 17 and the flange portion 18 are joined by welding or the like.
The cylindrical portion 17 and the collar portion 18 may be made of stainless steel or the like. The cylindrical portion 17 and the collar portion 18 that constitute the embedding plug 16 may be integrally formed of a resin such as nylon.
At this time, the weight of the sleeper 1 can be expected to be reduced. That is, when a plurality of embedded plugs are integrally fixed via one flange, the larger the flange, the heavier it is. However, in this sleeper 1, since the plurality of embedded plugs 16 are independent of each other, the embedded plugs 16 can be made lighter, and the overall weight of the sleeper 1 can be expected to be reduced.

The adhesive 21 is made of polyurethane resin, epoxy resin, acrylic resin, or the like. As shown in FIG. 3, the adhesive 21 is filled between the inner surface of the embedding hole 12 and the outer surface of the collar portion 18 of the embedding plug 16 to fix the inner surface of the embedding hole 12 and the outer surface of the embedding plug 16. there is The radially outer side of the proximal outer surface portion 18a is covered with the adhesive 21 while the adhesive 21 is in contact therewith. The radially outer side of the proximal outer surface portion 18 a may not be covered with the adhesive 21 .
As shown in FIG. 4 , the lower surface of the adhesive body 21 is flush with the lower surface of the sleeper body 11 .

As shown in FIG. 1, for example, a rail 52 is fixed on the sleeper body 11 via a tie plate 54 . The tie plate 54 is formed with a bolt hole 54a for arranging a fixing bolt 55 therein.
Note that FIG. 1 does not show one of the pair of fixing bolts 55 that fix the rail 52 .

A method for fixing the rail 52 to the tie plate 54 is not particularly limited. In this example, a bolt 58 is fitted to a female screw (not shown) formed in the tie plate 54 . One end of a washer 59 arranged on the tie plate 54 is arranged above the rail base 52 a of the rail 52 . By tightening the nut 60 fitted to the bolt 58, the rail base 52a is pressed downward via the washer 61 and the washer 59. As shown in FIG. The rail 52 is fixed to the tie plate 54 as described above.

A fixing bolt 55 is arranged in the bolt hole 54 a of the tie plate 54 . The male thread of the fixing bolt 55 is fitted into the female thread of the embedded plug 16 . A washer 63 is arranged between the head of the fixing bolt 55 and the tie plate 54 .

Next, a method for manufacturing the sleeper 1 of the present embodiment (hereinafter simply referred to as a manufacturing method) for manufacturing the sleeper 1 configured as described above will be described. FIG. 5 is a flow chart showing the manufacturing method S10 of this embodiment.
First, in the hole forming step (step S11 shown in FIG. 5), the embedding hole 12 is formed in the sleeper body 11 as shown in FIG. A drill having a cylindrical drill bit, for example, is used to form the embedding hole 12 . As the embedding holes 12, a small diameter hole portion 12a and a large diameter hole portion 12b are formed.
After the hole forming step S11 is completed, the process proceeds to step S13.

Next, in the embedding plug arranging step (arranging step, step S13), the embedding plug 16 is inserted into the embedding hole 12 of the sleeper body 11 . More specifically, the cylindrical portion 17 of the embedding plug 16 is inserted into the small diameter hole portion 12 a of the embedding hole 12 , and the collar portion 18 of the embedding plug 16 is inserted into the large diameter hole portion 12 b of the embedding hole 12 .
The tubular portion 17 may be inserted so that the tubular portion 17 protrudes outward from the small-diameter hole portion 12a, or the flange portion 18 may be inserted so that the tubular portion 18 protrudes outward from the large-diameter hole portion 12b. may be inserted. In this manner, at least part of the collar 18 of the embedding plug 16 is inserted into the embedding hole 12 . At this time, as described above, the separated outer surface portion 18b of the collar portion 18 is arranged so as not to face the adjacent inner surface portion 12b1 of the large-diameter hole portion 12b.
When the embedding plug placement step S13 ends, the process proceeds to step S15.

Next, in the step of arranging the plug (step S15), the internal circumference of the drain hole of the plug 16 is fitted with the male thread formed on the bolt (hole plug) 71 by fitting the female thread of the plug 16. The surface is liquid-tightly closed with the outer peripheral surface of the bolt 71 protruding from the embedded plug 16 to the outside.
At this time, the bolt 71 is inserted into the internal thread of the embedded plug 16 from the collar portion 18 side. The male thread of the bolt 71 and the male thread of the fixing bolt 55 have the same outer diameter and thread pitch. It is preferable to select the length of the shaft portion of the bolt 71 so that the head portion of the bolt 71 protrudes outside from the embedding hole 12 of the sleeper body 11 .
Note that the embedding plug placement step S13 may be performed after performing the hole plug placement step S15 in advance.
When the hole plug placement step S15 is completed, the process proceeds to step S17.

Next, in the fixing step (step S17), the inner surface of the embedding hole 12 and the outer surface of the embedding plug 16 are fixed with the adhesive 21. Next, as shown in FIG. More specifically, the fluid adhesive composition 21A is poured between the inner surface of the large-diameter portion 12b of the embedding hole 12 and the outer surface of the collar portion 18 of the embedding plug 16. As shown in FIG. The adhesive composition 21A is, for example, a mixture of polyol and diisocyanate. Since the cylindrical portion 17 of the embedding plug 16 and the small diameter hole portion 12a of the embedding hole 12 are closed in a liquid-tight manner, the adhesive composition 21A passes between the cylindrical portion 17 and the small diameter hole portion 12a. and does not flow downwards.
When the polyol and diisocyanate are cured by polymerization to form an adhesive 21 made of polyurethane, the adhesive 21 fixes the sleeper main body 11 and the embedded plug 16 .
It is preferable to determine the amount of the adhesive composition 21A to be poured into the embedding hole 12 so that the adhesive 21 protrudes outside from the embedding hole 12 when the adhesive composition 21A is polymerized and changed into the adhesive 21. .
The type of adhesive 21A is not limited to a mixture of polyol and diisocyanate. Examples include epoxy resin, polyester resin, vinyl ester resin, and phenol resin.
After the fixing step S17 is completed, the process proceeds to step S19.

Next, in the removing step (step S19), as shown in FIG. 7, the outside of the sleeper body 11 and the internal space of the embedded plug 16 are separated from each other through the drain hole by removing the bolt 71 from the drain hole. communicate.
Specifically, the male screw of the bolt 71 is removed from the female screw of the plug 16 by engaging a wrench or the like (not shown) with the head of the bolt 71 and rotating the bolt 71 around the axis. At this time, even if the embedding plug 16 rotates around the central axis C1 of the cylindrical portion 17, the flange portion 18 is locked to a predetermined portion (locking portion) of the large diameter hole portion 12b. That is, in the present embodiment, the separated outer surface portion 18b of the collar portion 18 is engaged with the proximal inner surface portion b1 (engagement portion) of the large-diameter hole portion 12b in the circumferential direction of the cylindrical portion 17. As shown in FIG. This restricts the co-rotation of the embedded plug 16 .
After the removal step S19 is completed, the process proceeds to step S21.

Next, in the flattening step (step S21), the outer surface of the bonded body 21 is made flush with the outer surface of the sleeper body 11. Next, as shown in FIG. A known sanding machine or the like is used to make the outer surface flush.
All steps of the manufacturing method S10 are completed as described above, and the sleeper 1 is manufactured. After manufacturing the sleeper 1, the lower surface of the sleeper body 11 is arranged downward. A tie plate 54 is fixed to the sleeper 1 with a fixing bolt 55 or the like, and a rail 52 is fixed to the tie plate 54 with a bolt 58 or the like.

In the sleeper 1 constructed and manufactured as described above, the case where the embedded plug 16 tends to rotate around the central axis C1 of the cylindrical portion 17 due to the rotation of the fixing bolt with respect to the sleeper main body 11 will be described. .
From the state where the collar portion 18 is arranged in the large diameter hole portion 12b of the embedding hole 12, the embedding plug 16 is rotated around the center axis C1. A distance L3 between the adjacent inner surface portion 12b1 of the large-diameter hole portion 12b and the central axis C1 is shorter than a distance L2 between the separated outer surface portion 18b of the collar portion 18 and the central axis C1. Therefore, when the embedded plug 16 rotates around the central axis C1, the spaced outer surface portion 18b is engaged with the adjacent inner surface portion b1 in the circumferential direction of the tubular portion 17. As shown in FIG.
Therefore, the sleeper 1 and the manufacturing method S10 of the present embodiment suppress the embedded plug 16 from rotating around the central axis C1 of the cylindrical portion 17 .

The collar portion 18 has an elliptical shape in plan view, and the center of gravity P1 of the collar portion 18 is arranged at a position separated from the central axis C1. When the flange portion 18 has an elliptical shape in plan view, the embedded plug 16 can be prevented from rotating around the central axis C1.

The configuration of the sleeper 1 of this embodiment can be modified in various ways as described below.
The sleeper 2 shown in FIGS. 8 and 9 has an embedded plug 26 instead of the embedded plug 16 of the sleeper 1 . Note that a part of the adhesive 21 is not shown in FIG. The embedded plug 26 has a flange 27 instead of the flange 18 of the embedded plug 16 .
The flange portion 27 is formed in a plate shape. The flange portion 27 is provided on the outer peripheral surface of the lower end portion of the tubular portion 17 over the entire circumference of the tubular portion 17 . The flange portion 27 has a rectangular shape in plan view. The center of gravity P5 of the collar portion 27 is arranged at a position spaced apart from the central axis C1 of the tubular portion 17 . The center of gravity P5 of the collar portion 27 is arranged at a position deviated (separated) from the center axis C1 along the long side of the rectangle of the collar portion 27 .

The collar portion 27 has a proximate outer surface portion 27a and a separated outer surface portion 27b on the outer peripheral surface of the collar portion 27 . The proximal outer surface portion 27a is a portion of the outer peripheral surface of the collar portion 27 where the distance L5 from the central axis C1 of the cylindrical portion 17 is the shortest. The spaced outer surface portion 27b is a portion where the distance L6 between the outer peripheral surface of the collar portion 27 and the center axis C1 is the maximum.
The spaced outer surface portion 27b is arranged at a rectangular corner portion of the collar portion 27 on the side spaced from the central axis C1. A distance L6 between the distant outer surface portion 27b and the center axis C1 is longer than a distance (minimum distance) L5 between the adjacent outer surface portion 27a and the center axis C1.
The distance between the inner peripheral surface of the large-diameter hole portion 12b and the center axis C1 is the minimum distance L7 at the adjacent inner surface portion 12b2, which is a part of the inner peripheral surface of the large-diameter hole portion 12b. The distance L7 is shorter than the distance L6 between the spaced outer surface portion 27b and the center axis C1. The separated outer surface portion 27b of the collar portion 27 is arranged so as not to face the adjacent inner surface portion 12b2 of the large diameter hole portion 12b.

A case where the embedded plug 26 of the sleeper 2 constructed and manufactured as described above is about to rotate around the central axis C1 of the cylindrical portion 17 will be described.
A distance L7 between the proximal inner surface portion 12b2 of the large-diameter hole portion 12b and the central axis C1 is shorter than a distance L6 between the distant outer surface portion 27b and the central axis C1. Therefore, when the embedded plug 26 rotates around the central axis C1, the spaced outer surface portion 27b is engaged with the adjacent inner surface portion b2 in the circumferential direction of the cylindrical portion 17. As shown in FIG.
Therefore, even with the sleeper 2 of the modified example, the embedded plug 26 can suppress the rotation of the cylindrical portion 17 around the central axis C1.

The sleeper 3 shown in FIGS. 10 and 11 has an embedded plug 31 instead of the embedded plug 16 of the sleeper 1 . The embedded plug 31 has a flange 32 instead of the flange 18 of the embedded plug 16 .
The flange portion 32 is formed in a plate shape. The collar portion 32 is provided on the outer peripheral surface of the lower end portion of the tubular portion 17 and around the entire circumference of the tubular portion 17 . The flange portion 32 has a polygonal shape in plan view. A center P11 of the circumscribed circle C3 of the collar portion 32 is arranged at a position spaced apart from the central axis line C1 of the cylindrical portion 17 . The center of gravity P11 of the collar portion 32 is arranged at a position deviated (separated) from the center axis C1 to the central portion of the polygonal side of the collar portion 27 .

The flange portion 32 has a proximate outer surface portion 32a and a separated outer surface portion 32b on the outer peripheral surface of the flange portion 32 . The proximal outer surface portion 32a is a portion of the outer peripheral surface of the collar portion 32 where the distance L9 from the central axis C1 of the cylindrical portion 17 is the shortest. The proximal outer surface portion 32a is arranged in the central portion of the side of the collar portion 32 that is close to the central axis C1. The spaced outer surface portion 32b is a portion of the outer peripheral surface of the collar portion 32 where the distance L10 from the center axis C1 is the maximum. The spaced outer surface portion 32b is arranged at a corner portion of the collar portion 32 spaced apart from the central axis C1. A distance L10 between the distant outer surface portion 32b and the center axis C1 is longer than a distance L9 between the adjacent outer surface portion 32a and the center axis C1.
The distance between the inner peripheral surface of the large-diameter hole portion 12b and the center axis C1 is the minimum distance L11 at the adjacent inner surface portion 12b3 that is part of the inner peripheral surface of the large-diameter hole portion 12b. The distance L11 is shorter than the distance L10 between the spaced outer surface portion 32b and the center axis C1.

A case where the embedded plug 31 of the sleeper 3 constructed and manufactured as described above is about to rotate around the central axis C1 of the cylindrical portion 17 will be described.
A distance L11 between the proximal inner surface portion 12b3 of the large-diameter hole portion 12b and the central axis C1 is shorter than a distance L10 between the distant outer surface portion 32b and the central axis C1. Therefore, when the embedded plug 31 rotates around the center axis C1, the spaced outer surface portion 32b engages the proximal inner surface portion 12b3 in the circumferential direction of the cylindrical portion 17. As shown in FIG.

Therefore, when the collar portion 32 has a polygonal shape in plan view like the sleeper 3 of the modified example, the embedded plug 31 can suppress the rotation of the cylindrical portion 17 around the central axis C1.
In addition, in this modification, the collar portion may have a quadrangular shape, an octagonal shape, or the like, or a circular shape (perfectly circular shape) in a plan view.

In the sleeper 4 shown in FIG. 12, two pairs of embedding holes 12 are formed at the ends of the sleeper body 11 in the width direction. The two pairs of embedding holes 12 are arranged in a grid pattern.
In the two pairs of embedding holes 12, the central axis of the small diameter hole portion 12a of the pair of embedding holes 12 arranged on one side in the longitudinal direction is shifted to the other longitudinal direction with respect to the central axis of the large diameter hole portion 12b. are at a distance. The central axis of the small-diameter hole portion 12a in the pair of embedding holes 12 arranged on the other side in the longitudinal direction is deviated (separated) from the central axis of the large-diameter hole portion 12b to one side in the longitudinal direction.
The pull-out resistance of the embedding hole 12 is strengthened by the pull-out shearing force of the collar portion 18 pulling out the sleeper body 11 . Since reinforcing fibers (long glass fibers) are arranged in the sleeper body 11 along the width direction (long axis direction of the sleeper body 11), the pull-out shear resistance is further increased. As shown in FIG. 12, when the central axis of the small-diameter hole 12a is deviated (separated) from the central axis of the large-diameter hole 12b in the longitudinal direction (the width direction of the sleeper body 11), it is arranged along the width direction. A larger number of the long fibers that are forming are caught by the collar portion 18, increasing the shear resistance. As a result, the withdrawal resistance of the embedded hole 12 can be increased.

If the adhesive body is made of a material that is as hard as the sleeper body 11 and the embedded plug 16, the radially outer side of the adjacent outer surface portion 18a is pressed by the adhesive body while the adhesive body is in contact with the proximal outer surface portion 18a. May be covered. In this case, in the fixing step S17, the adhesive covers the radially outer side of the proximal outer surface portion 18a while being in contact with the proximal outer surface portion 18a.
In the thus constructed sleeper, the distance L2 between the separated outer surface portion 18b and the central axis C1 is longer than the distance L1 between the adjacent outer surface portion 18a and the central axis C1. Therefore, when the embedding plug 16 rotates around the central axis C1, the spaced outer surface portion 18b moves in the circumferential direction of the tubular portion to the adhesive body that covers the adjacent outer surface portion while being in contact with the adjacent outer surface portion on the radially outer side of the adjacent outer surface portion. Lock. Therefore, the embedded plug can be restrained from rotating around the central axis of the cylindrical portion.

An embodiment of the present invention has been described in detail above with reference to the drawings. The specific configuration is not limited to this embodiment, and includes modifications, combinations, deletions, etc. of the configuration without departing from the gist of the present invention.
For example, in the sleeper 1 of the embodiment, the predetermined value of the adjacent outer surface portion 18a is assumed to be the minimum value. However, the predetermined value is not particularly limited as long as it is smaller than the maximum value. The separated outer surface portion 18b is not particularly limited as long as it is a portion of the outer peripheral surface of the collar portion 18 whose distance from the center axis C1 is longer than a predetermined value.

Although the predetermined portion is the separated outer surface portion 18b of the outer peripheral surface of the flange portion 18, the predetermined portion is a portion of the outer peripheral surface of the flange portion 18 that is closer to the center axis C1 than the separated outer surface portion 18b. There may be.
The large-diameter hole may be large as long as the flange 18 intersects with the large-diameter hole when the plug 16 is rotated about the central axis C1 and the flange 18 is rotated.
The sleeper 1 may not be provided with the adhesive body 21 . In this case, the fixing step S17 and the flattening step S21 may not be performed in the manufacturing method S10.

The center of gravity P1 of the collar portion 18 may be arranged on the central axis C1. In this case, the flange portion 18 may be formed in a shape other than a circular shape in plan view, that is, a non-circular shape.
In the manufacturing method S10 of the embodiment, the hole plug placement step S15, the removal step S19, and the flattening step S21 may not be performed.

(Example)
EXAMPLES Hereinafter, examples and comparative examples of the present invention will be specifically shown and explained in more detail. The invention is not limited to the following examples.
The sleepers of Examples and Comparative Examples were constructed as follows.
- Sleeper main body: In both Examples and Comparative Examples, it was made of urethane foam reinforced with long glass fibers. The sleeper body has a width of 2400 mm, a length of 200 mm in the longitudinal direction, and a length of 200 mm in the vertical direction.
• Embedded plug: The embedded plug was formed as shown in Table 1.

The specifications of the embedding plug common to the examples and comparative examples are as follows. An example plug 36 is shown in FIGS. An embedded plug 41 of a comparative example is shown in FIGS. 15 and 16. FIG. The embedded plugs 36, 41 are made of iron. The vertical length of the tubular portion 37 is 131 mm, and the outer diameter of the tubular portion 37 is 29 mm. The internal thread of the cylindrical portion 37 was formed so that an M20 metric coarse thread was fitted.
As shown in FIGS. 13 and 14, the collar portion 38 of the embedding plug 36 of the example had a circular shape with an outer diameter of 79 mm in plan view and a thickness of 19 mm. The deviation between the central axis of the tubular portion 37 and the central axis of the flange 38 was set to 7.5 mm.
As shown in FIGS. 15 and 16, the flange portion 42 of the embedding plug 41 of the comparative example had a square shape with a side of 70 mm in plan view and a thickness of 19 mm. The deviation between the central axis of the cylindrical portion 37 and the central axis of the collar portion 42 was determined to be 0 mm, that is, the central axis of the cylindrical portion 37 and the central axis of the collar portion 42 were coaxial.

A urethane adhesive was used as the adhesive.

Incidentally, the small-diameter hole portion of the embedding hole formed in the sleeper of the example was formed with a φ30 mm drill or the like. The large-diameter portion of the embedding hole was formed in one step using a φ80 mm drill.
The small-diameter hole portion of the embedding hole formed in the sleeper of the comparative example was formed with a φ30 mm drill or the like. The large-diameter portion of the embedding hole was formed by punching with a φ60 mm drill or the like while shifting the position four times.

As a result, the drilling time required to form one embedding hole was as follows. In the example, the small diameter hole was 40 seconds, and the large diameter hole was 40 seconds. In the comparative example, the small-diameter hole was 40 seconds and the large-diameter hole was 160 seconds.
It is assumed that four embedding holes are formed in one sleeper body. In this case, the drilling time required to form the embedding holes in the example sleeper body is 320 seconds. The drilling time required to form the embedding holes in the sleeper body of the comparative example is 800 seconds.
It was found that the drilling time required for forming the embedding holes can be shortened in the sleepers of the example compared to the sleepers of the comparative example.

(Second embodiment)
A sleeper according to a second embodiment of the present invention will now be described with reference to FIG.
In the second embodiment, the same reference numerals are assigned to the same components as in the first embodiment, the description thereof is omitted, and only the different points will be described.

The sleeper 2 of this embodiment includes a sleeper body 21 , an embedded plug 16 and an adhesive body 21 .
The embedding plug 16 has a threaded portion 47 and a collar portion 18 . The threaded portion 47 is shaft-shaped. A male thread is formed on the outer peripheral surface of the threaded portion 47 . The flange 18 is provided at the end of the threaded portion 47 . The embedded plug 16 is shaped like an anchor bolt as a whole. The threaded portion 47 is fixed to the sleeper body 21 via the adhesive 21 . The threaded portion 47 is fixed to the sleeper body 21 by tightening a member 65 having an internal thread from above. Member 65 is a screw with a top. The internal thread is formed on the inner peripheral surface of the member 65 . A portion of the member 65 is arranged within the embedding hole 12 .
In addition, although the large-diameter hole portion has a circular shape in the above-described embodiment, it may not have a circular shape.

According to the present invention, it is possible to suppress the rotation of the embedded plug about the central axis of the threaded portion.

1, 2, 3, 4 sleeper 11 sleeper main body 12 embedded hole 12b1, 12b2, 12b3 proximal inner surface portion 16, 26, 31, 36 embedded plug 17, 37 cylindrical portion (threaded portion)
18, 27, 32, 38 collar portion 18a, 27a, 32a adjacent outer surface portion 18b, 27b, 32b separated outer surface portion (predetermined portion)
21 Bonded body 47 Threaded part C1 Center axis line C3 Circumscribed circle L1, L2, L3 Distance P1 Center of gravity P11 Center S10 Manufacturing method (manufacturing method of sleepers)
S11 Hole forming step S13 Embedded plug placement step (placement step)
S17 fixing step

Claims (6)

a sleeper body having a top surface on which a rail is arranged and a bottom surface facing a ground surface, and having a plurality of embedded holes penetrating from the top surface to the bottom surface;
a plurality of embedding plugs at least partially disposed within the embedding holes;
The embedded hole has a large hole portion at its bottom,
the large hole portions of the plurality of embedding holes are spaced apart from each other,
The embedded plug
a threaded portion;
a flange provided at the lower end of the threaded portion and arranged in the large hole;
The flange has an elliptical shape when viewed in a direction along the central axis of the threaded portion,
When the sleeper main body is viewed from the central axis direction of the threaded portion, the central axis of the threaded portion and the central axis of the flange portion are separated from each other in the major axis direction of the elliptical shape ,
A sleeper, wherein an inner peripheral surface of the wide hole portion has a locking portion to which the flange portion locks when the embedded plug rotates around the central axis of the threaded portion. 2. The sleeper according to claim 1, wherein the center of gravity of said collar portion is arranged at a position spaced apart from the central axis of said threaded portion. The engaging portion is a proximal inner surface portion that is a portion having a predetermined distance from the central axis of the threaded portion,
3. The sleeper according to claim 1 , wherein a distance from the central axis of said threaded portion to a predetermined portion of the outer peripheral surface of said flange is longer than said predetermined value. The sleeper according to any one of claims 1 to 3 , further comprising an adhesive for fixing the inner surface of the embedding hole and the outer surface of the embedding plug. The collar portion
a proximate outer surface portion, which is a portion of the outer peripheral surface of the collar portion that has a predetermined distance from the central axis of the threaded portion;
a spaced outer surface portion, which is a portion of the outer peripheral surface of the collar portion, the distance from the center axis of the threaded portion being longer than the predetermined value;
5. The sleeper according to claim 4 , wherein the adhesive body is arranged over the entire circumference between the outer peripheral surface of the flange portion and the inner peripheral surface of the large hole portion. A method for manufacturing a sleeper according to any one of claims 1 to 5 ,
a hole forming step of forming the embedded hole in the sleeper body;
and an arrangement step of inserting at least part of the collar portion of the embedding plug into the embedding hole.

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